How to determine range from periscope?
 

I'm playing SH3 w/ the awesome GWX mod. I found Sawdust's tables that convert mils off the periscope reticule to a range based on mast height (thanks Sawdust - great work). However, GWX increases the periscope magnification to 10x. Does anyone know the equation to determine range based on mast head height and mils, so I can make my own table based on the new magnification? Thanks.